Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 563
The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2011, 11:58 PM CDT for 20 counties in Oklahoma; Hemphill County, Lipscomb County, Ochiltree County, Texas. It was in force for 92 min.
The area
The outline as issued.
The facts
- Issued
- Apr 24, 2011, 11:58 PM CDT (04:58 UTC)
- Expired
- Apr 25, 2011, 1:30 AM CDT
- In force
- 92 min
- Issued by
- the Storm Prediction Center
All 23 counties
Alfalfa County, OK, Beaver County, OK, Blaine County, OK, Canadian County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Lipscomb County, TX, Ochiltree County, TX
The radar
The Vance AFB radar (KVNX), 83 km from the middle of the area, began a volume at 04:59 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Lamont, OK (KLMN), launched 00:00Z, 5.0 hours before the alert went out and 131 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 598 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 280 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
558
ACUS11 KWNS 250459
SWOMCD
SPC MCD 250458
OKZ000-KSZ000-TXZ000-250630-
MESOSCALE DISCUSSION 0563
NWS STORM PREDICTION CENTER NORMAN OK
1158 PM CDT SUN APR 24 2011
AREAS AFFECTED...ERN PORTIONS TX/OK PANHANDLES...WRN/NRN
OK...EXTREME S-CENTRAL KS.
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 250458Z - 250630Z
POTENTIAL MAY INCREASE THROUGH 09Z FOR SVR TSTMS WITH LARGE
HAIL...MOVING ENEWD WHILE THREAT SPREADS EWD ACROSS THIS AREA.
EXPECT MID-UPPER TROUGH...APCHG FROM SWRN CONUS...TO YIELD
SIMULTANEOUS STRENGTHENING OF DEEP-LAYER SHEAR...ELEVATED/LOW-LEVEL
WAA/MOISTURE TRANSPORT ABOVE COOL/STABLE BOUNDARY LAYER...AND
MID-UPPER LEVEL ASCENT/COOLING OVER THIS AREA. NET RESULT WILL BE
FAVORABLE DEEP-LAYER ASCENT/DESTABILIZATION FOR ELEVATED TSTMS TO
DEVELOP...IN ENVIRONMENT CHARACTERIZED BY 45-55 KT EFFECTIVE
SHEAR...FAVORABLE STORM-RELATIVE WINDS IN ELEVATED INFLOW
LAYER...AND INCREASING BUOYANCY. MUCAPE WILL INCREASE WITH EWD
EXTENT AND WITH TIME ACROSS DISCUSSION AREA...REACHING UP TO 2000
J/KG NEAR I-40 IN CENTRAL OK THROUGH 09Z. IR IMAGERY INDICATES
COOLING LOW-MIDLEVEL CLOUDS OVER THIS REGION...EVIDENCE OF
AFOREMENTIONED ASCENT SPREADING EWD OVER REGION AND PROBABLE
PRECURSOR TO ADDITIONAL DEEP-CONVECTIVE FORMATION DURING NEXT FEW
HOURS. WHILE FOCI IN ELEVATED-INITIATION SITUATIONS TYPICALLY ARE
RATHER NEBULOUS...CONVECTION MAY BECOME MOST CONCENTRATED INVOF
850-MB WARM FRONT OVER NWRN/N-CENTRAL OK...IN LAYER PROGGED TO
EXPERIENCE GREATEST ASCENT THROUGH REMAINDER OVERNIGHT HOURS.
..EDWARDS.. 04/25/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...ICT...OUN...DDC...AMA...
LAT...LON 36590085 36980009 37129879 37159769 36929695 36509683
35759688 35399776 35469887 35720042 35970093 36590085SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 7:35 PM CDT | Mesoscale Discussion | SPC | Beaver | 2 hr |
| Apr 24, 10:13 PM CDT | Mesoscale Discussion | SPC | McCurtain | 2 hr |
| Apr 24, 11:43 PM CDT | Severe Thunderstorm Watch | SPC | McCurtain | 5 hr |
| Apr 25, 4:41 AM CDT | Severe Thunderstorm Watch | SPC | Choctaw, Latimer, LeFlore, McCurtain, Pushmataha | 7 hr |
| Apr 25, 10:46 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Johnston, Latimer and 4 more | 59 min |
| Apr 25, 11:00 AM CDT | Tornado Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Haskell and 14 more | 7 hr |
| Apr 25, 1:28 PM CDT | Mesoscale Discussion | SPC | Adair, Atoka, Bryan, Carter, Cherokee, Choctaw and 21 more | 92 min |
| Apr 25, 3:22 PM CDT | Tornado Watch | SPC | McCurtain | 8 hr |
| Apr 25, 5:24 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Canadian, Cleveland, Comanche, Cotton and 13 more | 66 min |
| Apr 24, 8:48 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Coleman, Collin, Comanche and 36 more | 117 min |
| Apr 24, 11:25 PM CDT | Mesoscale Discussion | SPC | Bosque, Brown, Callahan, Camp, Coke, Coleman and 39 more | 65 min |
| Apr 25, 3:29 AM CDT | Mesoscale Discussion | SPC | Bosque, Camp, Collin, Dallas, Delta, Denton and 24 more | 61 min |
| Apr 25, 7:23 AM CDT | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Gregg, Harrison, Marion and 3 more | 97 min |
| Apr 25, 2:16 PM CDT | Mesoscale Discussion | SPC | Angelina, Bastrop, Bell, Blanco, Brazos, Burleson and 27 more | 59 min |
| Apr 25, 2:41 PM CDT | Tornado Watch | SPC | Anderson, Angelina, Bastrop, Bell, Blanco, Bosque and 49 more | 9 hr |
| Apr 25, 5:21 PM CDT | Mesoscale Discussion | SPC | Bosque, Delta, Ellis, Henderson, Hill, Hopkins and 7 more | 54 min |
| Apr 25, 6:57 PM CDT | Mesoscale Discussion | SPC | Anderson, Angelina, Bell, Blanco, Brazos, Burleson and 22 more | 2 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 2011Every mesoscale discussion in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.